I am trying to process a large number of text files. These text files contain either of the following two consecutive lines:

"_atom_site_fract_z" followed by "#END"

or

"_atom_site_fract_z" followed by strings such as "C1 C 0.46450 0.18880 0.92540"

I want to use bash/sed to only keep the files that are of the later type (files that does NOT have "_atom_site_fract_z" followed by "#END").

How do I achieve this?

NOTE: Two strings are separated by a NEWLINE. They are not separated by a space.

UPDATE: The name of files are stored in a text file, and I want to read the text file, line by line, to check if I should keep the file or not. I do not necessarily want to delete them, but want to save the files that are of later type in a separate folder within the directory.

UPDATE2: There are "other lines" besides these two lines. I want to search the file that has the particular combination of two lines. ALL files have both "_atom_site_frac_z" and "#END", but they don't appear immediately after one another. However, "_atom_site_frac_z" ALWAYS appear before "#END".